Alert archive / Oklahoma / Mesoscale Discussions in 2015
Mesoscale Discussion 365
The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2015, 6:21 PM CDT for 17 counties in Oklahoma. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2015, 6:21 PM CDT (23:21 UTC)
- Expired
- Apr 18, 2015, 7:45 PM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 95%
Counties Canadian County, OK, Carter County, OK, Cleveland County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Murray County, OK, Okfuskee County, OK, Oklahoma County, OK, Pawnee County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK
The radar
The Norman radar (KTLX), 27 km from the middle of the area, began a volume at 23:24 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 11.4 hours before the alert went out and 24 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1320 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 11 m²/s²
- 0-3 km storm-relative helicity
- -8 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 17, 7:26 PM CDT | Mesoscale Discussion | SPC | Texas | 2 hr |
| Apr 18, 12:45 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Canadian, Garfield, Grant, Kingfisher and 4 more | 60 min |
| Apr 18, 1:52 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 19 more | 113 min |
| Apr 18, 2:27 PM CDT | Tornado Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Comanche, Cotton and 16 more | 6 hr |
| Apr 18, 4:07 PM CDT | Mesoscale Discussion | SPC | Garfield, Grant, Kay, Kingfisher, Lincoln, Logan and 5 more | 2 hr |
| Apr 18, 6:03 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Comanche, Cotton and 13 more | 87 min |
| Apr 18, 6:31 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 38 more | 6 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2015Every mesoscale discussion in 2015
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.